以二氧化碳與部分氧化進行流體化床稻殼熱裂解之生質油產出與升級

Abstract

本研究的重點是改進流化床稻殼熱解工藝，解決工業化規模和生質油品質改善的挑戰。在煙道氣組成的基礎上，研究了不同的流化氣體組成，以優化熱效率和化學反應，影響產品的產率和品質。具體來說，二氧化碳的引入顯著改變了生質油的產量和合成氣的組成，增加了一氧化碳含量，同時由於焦炭氣化的反應器溫度不足而維持了焦炭的特性。 RFCC廢棄觸媒的引入影響了產品的產率和品質，提高了生質油的組成，增加了輕質化合物和酚含量。觀察到觸媒的效果取決於反應器設置，突出表明其僅與熱裂解氣體結合，並且由於觸媒壽命的限制，其在連續運行中存在局限性。為了提高能源效率，研究了在反應器內引入氧氣進行部分氧化反應。即使在6%的重量下，氧氣也會大幅提高反應器溫度，導致焦炭產量降低，合成氣成分發生變化，包括生質油中二氧化碳和水含量升高。然而，由於進口氣體溫度較低，實現自熱狀態仍然具有挑戰性。與基本情況相比，反應器修改後的能耗降低了約33%。綜上所述，本研究為優化永續生物燃料生產的流化床熱裂解過程提供了研究，強調了氣體組成、觸媒利用和能源效率之間的相互作用。

This research focuses on enhancing the fluidized bed rice husk pyrolysis process and addressing challenges in commercial scale-up and bio-oil quality improvement. Various compositions of the fluidizing gas, based on flue gas composition, were investigated to optimize thermal efficiency and chemical reactions, impacting product yield and quality. Specifically, the introduction of CO2 significantly altered bio-oil yield and syngas composition, increasing CO content while maintaining bio-char characteristics due to insufficient reactor temperatures for char gasification. Introducing a RFCC Catalyst influenced product yield and quality, enhancing bio-oil composition with higher light compounds and increased phenol content. The catalyst's effects were observed to be dependent on reactor setup, highlighting its engagement solely with pyrolysis gas and its limitations in continuous operation due to catalyst lifespan. To improve energy efficiency, the introduction of O2 for combustion reactions within the reactor was explored. Even at a modest 6% by weight, oxygen substantially elevated reactor temperatures, leading to lower bio-char production and changes in syngas composition, including higher CO2 and water content in bio-oil. However, achieving autothermal conditions remained challenging due to low inlet gas temperatures. Reactor modifications resulted in approximately 33% reduced energy consumption compared to the base case scenario. Overall, this study provides insights into optimizing fluidized bed pyrolysis processes for sustainable biofuel production, emphasizing the interplay between gas composition, catalyst utilization, and energy efficiency